[Patch] Tango color theme extension

[Jan Moringen]

Hi,

I noticed that a version of the Tango color theme has been added
recently. Since I had a custom version of the Tango color theme, I
merged the two versions.

The introduced changes are:

      * Definition of the tango palette colors in a separate file
      * Faces for Smerge, Ediff, flyspell, Semantic and outline

Screenshots showing the Semantic and outline faces are attached.

The attached patch does not integrate the new file into the build
system.

Kind regards,
Jan

tango-semantic.png
Description: PNG image

tango-outline.png
Description: PNG image

tango-colors.merge-directive
Description: Text document